Improvement in extension-ladders



L. HAUERWAS.- Extension-Ladder.

No. 208,089. Patented Sept. 17.1878.

N.FE[ERS, PNOTO-UTHOGRAFNEJL WASHINGTON. D19

UNITED STATES PATENT OFFICE.

LUDWYIG HAUERWAS, OF HARTFORD, CONNECTICUT.

IMPROVEMENT IN EXTENSION-LADDERS.

Specification forming part of Letters Patent No. 208,089, datedSeptember 17, 1878; application filed July 29, 1878.

To all whom it may concern:

Be it known that I, Lnnwre HAUERWAS, of Hartford, in the county ofHartford and State of Connecticut, have invented certain new and usefulImprovements pertaining to an Extension-Ladder, of which the followingis a specification, reference being had to the accompanying drawings,where Figure 1 is a side view of a ladder embodyin g my improvements,elevated and extended. Fig. 2 is a front view of the same. Fig. 3 is adetail view, being an enlarged View of a portion of the side of theapparatus, illustrating the method of holding the lengths together 5 theladder is supposed to be extended. Fig. 4 is an end view of the partsshown in Fig. 3.

Letters Patent No. 194,089, dated August 14, 1877, were issued to me forimprovements pertaining to extension-ladders.

The present invention consists in improvements made on the device shownin my said former Letters Patent.

I show my ladder in the accompanying drawings in three lengths. Theprinciple is applicable to any reasonable number of lengths or sections.

The letter (t denotes the bottom or foot section; I) the middle section,and c the top section, each as a whole. The rails b b of the middle orsecond section are faced on the outside, being themselves of wood, withmetal plates or facings d, having a central groove, (1, running theirwhole length. The foot and top sections are furnished with clamp-fingers6, taking into these grooves. The middle section is furnished withclamp-fingers f, which embrace and slide upon the rails a a,respectively, of the foot and top sections. These clamp-fingers and thelongitudinally-grooved facin gs d constitute the means for holding thesections together.

'When the middle section has been elevated to the proper height, whichis accomplished by pulling on the cord g, which runs over the pulley h,it is held there by the catches t, which spring into place. In my formerpatent I show forked catches for this purpose. 111 the present instancethey are not so forked. These catches can be pulled from under themiddle section by means of the eordj. 'The top section is held toelevation in the same manner.

I have devised an improved intermediate support for the ladder. Theletters Jo denote sockets fixed to the side of a section, and Zremovablesupporting-arms, having lateral extension from the sides of the ladder,to avoid windows, ladders being commonly narrower than windows. Theseremovable arms give the ladder greater compactness when folded up, andby having sockets therefor at different points one set can serve wheremore would be needed in my former plan.

I have devised a new means for at once holding the rails together andpreventing the rounds from working endwise. The letter in denotes aniron rod next a wooden round, a. On the ends of this iron rod are nutsm, abutting against the ends of the round, and also against the rails ofthe ladder.

I claim as my improvements 1. The laddersection 0, provided with thesockets k, in combination with the laterallyextended and removablesupports 1, all substantially as described, and for the purpose setforth.

2. The ladder rails a, the round a, the rod m, and the nuts m, abuttingon the ends of the round and also against the rails, all combinedsubstantially as described, for the purpose set forth.

LUDWIG HAUERWAS.

Witnesses WM. E. SIMoNDs, S. E. CARPENTER.

